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Income Taxes - Components of Net Deferred Tax Assets and Related Valuation Allowance (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:        
Net operating loss carryforwards $ 43,623 $ 52,034    
Stock-based compensation 4,653 5,298    
Accrued expenses 2,429 1,266    
Allowance for returns and credit losses 1,169 1,468    
Research and development and orphan drug credit carryforwards 37,737 36,041    
Other 3,279 4,572    
Total deferred tax assets 92,890 100,679    
Deferred tax liabilities:        
Intangible assets (1,911) (1,994)    
Other (2,412) (2,850)    
Total deferred tax liabilities (4,323) (4,844)    
Deferred tax assets, net 88,567 95,835    
Less: Valuation allowance 7,051 8,155 $ 111,950 $ 116,110
Net deferred tax assets $ 81,516 $ 87,680